I seem to recall the similar Grunding of my parents back in the mid 50's had a row of 5-6 knobs at bottom center which controlled various audio frequency bands. The visual indications were small beads tied together with red elastic strips behind the glass panel. As the knobs were adjusted the beads moved up or down about 1-2 cm, the elastics stretched and followed to form a mechanical visual display of the resulting frequency resonse.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.